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    <h2>相对路径:</h2>
    <h2>当前文件夹：./</h2>
    <h2>上一级文件夹：../</h2>
    <h2>进入某个文件夹：/</h2>

    <h2>绝对路径:</h2>
    <h2>Windows以盘符开始: D:\</h2>
    <h2>在线网址</h2>
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